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Segment Information Revenues and Operating Margin (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues        
Sales of commodities $ 1,623.8 $ 1,312.9 $ 3,481.7 $ 2,484.0
Fees from midstream services 243.9 270.7 498.6 542.0
Revenues 1,867.7 1,583.6 3,980.3 3,026.0
Operating margin 291.9 299.5 598.3 598.8
Gathering and Processing [Member]        
Revenues        
Revenues 1,023.6 753.7 2,023.8 1,394.3
Operating margin 173.5 139.1 351.1 254.7
Logistics and Marketing [Member]        
Revenues        
Revenues 1,640.8 1,338.8 3,551.7 2,579.4
Operating margin 112.4 141.8 242.4 298.5
Other Segment [Member]        
Revenues        
Revenues 6.0 18.6 4.9 45.7
Operating margin 6.0 18.6 4.9 45.7
Corporate and Eliminations [Member]        
Revenues        
Revenues (802.7) (527.5) (1,600.1) (993.4)
Operating margin     (0.1) (0.1)
Operating Segments [Member]        
Revenues        
Sales of commodities 1,623.8 1,312.9 3,481.7 2,484.0
Fees from midstream services 243.9 270.7 498.6 542.0
Revenues 1,867.7 1,583.6 3,980.3 3,026.0
Operating Segments [Member] | Gathering and Processing [Member]        
Revenues        
Sales of commodities 177.5 158.7 344.3 269.0
Fees from midstream services 132.3 124.6 250.7 240.4
Revenues 309.8 283.3 595.0 509.4
Operating Segments [Member] | Logistics and Marketing [Member]        
Revenues        
Sales of commodities 1,440.3 1,135.6 3,132.5 2,169.3
Fees from midstream services 111.6 146.1 247.9 301.6
Revenues 1,551.9 1,281.7 3,380.4 2,470.9
Operating Segments [Member] | Other Segment [Member]        
Revenues        
Sales of commodities 6.0 18.6 4.9 45.7
Revenues 6.0 18.6 4.9 45.7
Intersegment Eliminations [Member] | Gathering and Processing [Member]        
Revenues        
Sales of commodities 712.4 468.6 1,425.5 881.0
Fees from midstream services 1.4 1.8 3.3 3.9
Revenues 713.8 470.4 1,428.8 884.9
Intersegment Eliminations [Member] | Logistics and Marketing [Member]        
Revenues        
Sales of commodities 81.8 52.7 157.2 100.0
Fees from midstream services 7.1 4.4 14.1 8.5
Revenues 88.9 57.1 171.3 108.5
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]        
Revenues        
Sales of commodities (794.2) (521.3) (1,582.7) (981.0)
Fees from midstream services (8.5) (6.2) (17.4) (12.4)
Revenues $ (802.7) $ (527.5) $ (1,600.1) $ (993.4)